WO1989012605A1 - Dosing device for liquid additives, in particular high viscosity additives - Google Patents

Dosing device for liquid additives, in particular high viscosity additives Download PDF

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Publication number
WO1989012605A1
WO1989012605A1 PCT/EP1989/000733 EP8900733W WO8912605A1 WO 1989012605 A1 WO1989012605 A1 WO 1989012605A1 EP 8900733 W EP8900733 W EP 8900733W WO 8912605 A1 WO8912605 A1 WO 8912605A1
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WO
WIPO (PCT)
Prior art keywords
pump
liquid
additives
dosing
additive
Prior art date
Application number
PCT/EP1989/000733
Other languages
German (de)
French (fr)
Inventor
Emil Brügel
Hans-Jörgen Rehm
Original Assignee
Henkel Kommanditgesellschaft Auf Aktien
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Henkel Kommanditgesellschaft Auf Aktien filed Critical Henkel Kommanditgesellschaft Auf Aktien
Priority to KR1019900700297A priority Critical patent/KR900701667A/en
Publication of WO1989012605A1 publication Critical patent/WO1989012605A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
    • B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
    • B67D7/06—Details or accessories
    • B67D7/58—Arrangements of pumps
    • B67D7/70—Arrangements of pumps of two or more pumps in series or parallel
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
    • C02F1/685—Devices for dosing the additives
    • C02F1/686—Devices for dosing liquid additives

Definitions

  • the invention relates to a metering system for liquid additives, in particular high viscosities, with a metering pump for the continuous treatment of liquids.
  • High viscosities mean viscosities from 300 mPas
  • the invention is therefore based on the object of providing a metering system of the type mentioned at the outset which enables better meterability and better mixing of the liquid additives.
  • This object is achieved according to the invention in a metering system of the type mentioned at the outset by a further pump, the input of which is connected to the outlet of the metering pump and to the liquid to be treated.
  • This additional pump draws in both wastewater and the very small volume flows of the liquid additive. These liquids are mixed intensively within the pump.
  • This premixing enables a much better mixing of the additive with the wastewater in the clarifier and thus a faster effectiveness of the additive. By premixing with the wastewater, the larger flows can now be metered better.
  • the additive is premixed without fresh water being introduced into the sewage system. This is achieved by using wastewater for premixing.
  • a particularly rapid effectiveness of the additive is achieved by means of Exnstoff nozzles connected to the outlet of the further pump and arranged above the surface of the liquid to be treated, for large-area application of the additive-liquid mixture to the liquid surface.
  • Exnstoff nozzles connected to the outlet of the further pump and arranged above the surface of the liquid to be treated, for large-area application of the additive-liquid mixture to the liquid surface.
  • the further pump is a self-priming centrifugal pump.
  • the additional pump can also be arranged above the wastewater surface.
  • the metering pump it is particularly advantageous if it is a diaphragm, diaphragm piston or piston pump.
  • the ratio of the liquid additive to the wastewater can be set not only by the first metering pump, but also if a bypass bridging the further pump and having a flow control valve is provided. The ratio can be set on this valve.
  • Figure I shows a dosing system according to the invention for the continuous dosing of a defoamer.
  • the dosing system consists essentially of the dosing pump (1) and the further pump (2) serving as a mixing or suspending pump, which is designed as a self-priming centrifugal pump.
  • the metering pump (1) is connected with its input to a template (5) for the liquid additive.
  • a suction strainer basket (4) arranged in the waste water (9) to be treated is connected to the input of the further pump (2) via a suction line (11) and the outlet of the metering pump (1).
  • Single-component axial nozzles (7) are connected to the outlet of the further pump (2) and are designed for large-area metering of the premixed liquid onto the liquid surface (10) of the waste water.
  • the further pump (2) is bridged by a bypass (3) which has a flow control valve (8).
  • the dosing system works as follows:
  • the metering pump (1) receives the undiluted liquid additive from the receiver (5) via a shut-off valve (6).
  • the pump (1) continuously doses this additive into the suction line (11) of the further pump (2).
  • This pump sucks from the sewage water tank to be fed with the additive Waste water (9) via the strainer basket (4). Waste water and additive reach the other pump (2), where they are mixed intensively.
  • the bypass flow rate IventiI (8) in the bypass (3) can be used to set the amount of bypass and thus the ratio of additive to waste water.
  • the mixture emerges as a homogeneous solution or as an emulsion, depending on the affinity of the additive for the waste water (9). This solution or emulsion is applied over the egg nstoff nozzles [7) over a large area on the clarifier surface (10).
  • a diaphragm metering pump from the manufacturer Pro-Minent of type B 25.001 was used as the metering pump (1) and a centrifugal pump from the manufacturer DIA pumps of the type SRV / SOV 211 as a further pump [2).
  • AJ s nozzles (7) were used with axial cone nozzles of type 460.748.16 CE from the manufacturer Lechler.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Accessories For Mixers (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

Dosing device for liquid additives (5), in particular those with a high viscosity, by means of a dosing pump (1) for the continuous processing of liquids. In order for the additive (5) to become effective more rapidly in the liquid (9) to be processed, a second pump (2) is used, the input of which is connected to the output of the dosing pump and to the liquid to be processed.

Description

Dosieranlage für Flüssiσadditive insbesondere hoher Viskositäten Dosing system for liquid additives, especially high viscosities
Die Erfindung betrxfft eine Dosieranlage für Flüssigadcitive insbesondere hoher Viskositäten mit einer Dosierpumpe zum kontinuierlichen Behandeln von Flüssigkeiten, Unter hohen Viskositäten sind Viskositäten ab 300 mPas zu ver stehenThe invention relates to a metering system for liquid additives, in particular high viscosities, with a metering pump for the continuous treatment of liquids. High viscosities mean viscosities from 300 mPas
Insbesondere zum Behandeln von Abwasser müssen Ströme von Flüssigadditiven kontinuierlich in sehr kleinen Mengen zum Abwasser zugegeben werden,. Diese Plüssigadditive werden dabei auf oder in die zu behandelnden Klärbecken dosiert. Bei dieser Abwasserbehandlung ist die gute Durchmischung des Addjtivs mit dem Abwasser von großer Bedeutung.In particular for treating wastewater, flows of liquid additives have to be continuously added to the wastewater in very small amounts. These liquid additives are dosed on or in the clarifiers to be treated. With this wastewater treatment, the good mixing of the additive with the wastewater is of great importance.
Bei einigen Fiüssigadditiven tritt das Problem auf., daß sie ausgesprochen schwer dosierbar sind und sich außerdem nur relativ langsam im zu behandelnden Abwasser verteilen. Dieses Problem tritt insbesondere bei Flüssigadditiven hoher Viskositäten auf.The problem with some liquid additives is that they are extremely difficult to dose and, moreover, are only relatively slowly distributed in the waste water to be treated. This problem occurs particularly with liquid additives with high viscosities.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Dosieranlage der eingangs genannten Art zu schaffen, die eine bessere Dosierbarkeit und eine bessere Durchmischung der Flüssigadditive ermöglicht. Diese Aufgabe wird erfindungsgemäß bei einer Dosieranlage der eingangs genannten Art durch eine weitere Pumpe, deren Eingang an den Ausgang der Dosierpumpe und an die zu behandelnde Flüssigkeit angeschlossen ist, gelöst. Diese weitere Pumpe saugt sowohl Abwasser als auch die sehr kleinen Mengenströme des Flüssigadditivs an. Innerhalb der Pumpe werden diese Flüssigkeiten miteinander intensiv gemischt. Durch diese Vorvermischung läßt sich eine sehr viel bessere Vermischung des Additivs mit dem Abwasser im Klärbecken und damit eine schnellere Wirksamkeit des Additivs erreichen. Durch die Vorvermischung mit dem Abwasser lassen sich ferner die nun größeren Mengenströme besser dosieren. In der erfindungsgemäßen Dosieranlage wird das Additiv vorvermischt, ohne daß Frischwasser in das Abwassersystem eingetragen wird. Dies wird erreicht, indem Abwasser zur Vorvermischung verwendet wird.The invention is therefore based on the object of providing a metering system of the type mentioned at the outset which enables better meterability and better mixing of the liquid additives. This object is achieved according to the invention in a metering system of the type mentioned at the outset by a further pump, the input of which is connected to the outlet of the metering pump and to the liquid to be treated. This additional pump draws in both wastewater and the very small volume flows of the liquid additive. These liquids are mixed intensively within the pump. This premixing enables a much better mixing of the additive with the wastewater in the clarifier and thus a faster effectiveness of the additive. By premixing with the wastewater, the larger flows can now be metered better. In the metering system according to the invention, the additive is premixed without fresh water being introduced into the sewage system. This is achieved by using wastewater for premixing.
Eine besonders schnelle Wirksamkeit des Additivs wird erreicht durch an den Ausgang der weiteren Pumpe angeschlossene, über der OberfIäche der zu behandelnden Flüssigkeit angeordnete Exnstoff-Düsen zum großflächigen Aufbringen des Additiv-Flüssigkeits-Gemisches auf die Flüssigkeitsober-fläche. Bei dieser großflächig aufgebrachten Dosierung wird durch die Vorvermischung, eine belästigende Aerosol-Bildung vermieden, wie sie bei der Dosierung des unvermischten Flüs-sigadditivs durch eine zum Verdüsen von hochviskosen Stoffen erforderliche Zweistoffdüse unvermeidbar wäre.A particularly rapid effectiveness of the additive is achieved by means of Exnstoff nozzles connected to the outlet of the further pump and arranged above the surface of the liquid to be treated, for large-area application of the additive-liquid mixture to the liquid surface. With this metering applied over a large area, the pre-mixing avoids the nuisance of aerosol formation that would be unavoidable when metering the unmixed liquid additive through a two-component nozzle required for atomizing highly viscous substances.
Ein besonders einfacher Aufbau der Dosieranlage und eine be-sonders gute Vorvermischung ergibt sich, wenn die weiterePumpe eine selbstansaugende Kreiselpumpe ist. In diesem Fall kann die weitere Pumpe nämlich auch oberhalb der Abwasser- oberflache angeordnet sein. Bei der Dosierpumpe ist es besonders vorteilhaft, wenn sie eine Membran-, Membrankolben- oder Kolbenpumpe ist.A particularly simple construction of the dosing system and a particularly good premixing result if the further pump is a self-priming centrifugal pump. In this case, the additional pump can also be arranged above the wastewater surface. With the metering pump, it is particularly advantageous if it is a diaphragm, diaphragm piston or piston pump.
Das Verhältnis des Flüssigadditivs zum Abwasser läßt sich nicht nur durch die erste Dosierpumpe, sondern auch dadurch einstellen, wenn ein die weitere Pumpe überbrückender, ein Durchflußregelventil aufweisender Bypass vorgesehen ist. An diesem Ventil läßt sich das Verhältnis einstellen.The ratio of the liquid additive to the wastewater can be set not only by the first metering pump, but also if a bypass bridging the further pump and having a flow control valve is provided. The ratio can be set on this valve.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and will be described in more detail below.
Figur I zeigt eine Dosieranlage gemäß der Erfindung zum kontinuierlichen Dosieren eines Entschäumers. Die Dosieranlage besteht im wesentlichen aus der Dosierpumpe (1) und der als Misch- bzw. Suspendierpumpe dienenden weiteren Pumpe (2), die als selbstansaugende Kreiselpumpe ausgeführt ist. Die Dosierpumpe (1) ist mit ihrem Eingang an eine Vorlage (5) für das Flüssigadditiv angeschlossen. Mit dem Eingang der weiteren Pumpe (2) ist ein im zu behandelnden Abwasser (9) angeordneter Ansaugsiebkorb (4) über eine Saugieitung (11) und der Ausgang der Dosierpumpe (1 ) verbunden . An den Ausgang der weiteren Pumpe (2) sind Einstoffaxialdüsen (7) angeschlossen, die zum großflächigen Dosieren der vorvermischten FTüssigkeit auf die Flüssigkeitsoberflache (10) des Abwassers ausgelegt sind. Die weitere Pumpe (2) iεt durch einen Bypass (3) überbrückt, der ein Durchflußregelventil (8) aufweist.Figure I shows a dosing system according to the invention for the continuous dosing of a defoamer. The dosing system consists essentially of the dosing pump (1) and the further pump (2) serving as a mixing or suspending pump, which is designed as a self-priming centrifugal pump. The metering pump (1) is connected with its input to a template (5) for the liquid additive. A suction strainer basket (4) arranged in the waste water (9) to be treated is connected to the input of the further pump (2) via a suction line (11) and the outlet of the metering pump (1). Single-component axial nozzles (7) are connected to the outlet of the further pump (2) and are designed for large-area metering of the premixed liquid onto the liquid surface (10) of the waste water. The further pump (2) is bridged by a bypass (3) which has a flow control valve (8).
Die Dosieranlage funktioniert wie folgt:The dosing system works as follows:
Die Dosierpumpe (1) erhält über eine Absperrarmatur (6) aus der Vorlage (5) das noch unverdünnte Flüssigadditiv. Die Pumpe (1) dosiert kontinuierlich dieses Addiriv in die Saugieitung (11) der weiteren Pumpe (2). Diese Pumpe saugt aus dem mit dem Additiv zu beschickenden Klärwasserbecken Abwasser (9) über den Ansaugsiebkorb (4) an. Abwasser und Additiv gelangen gemeinsam in die weitere Pumpe (2), wo sie intensiv gemischt werden. Über das Durchf I ußrege IventiI (8) im Bypass (3) läßt sich die Bypassmenge und damit das Verhältnis von Additiv zu Abwasser einstellen. Auf der Druckseite der Pumpe (2) tritt die Mischung je nach Affinität des Additivs zum Abwasser (9) als homogene Lösung oder als Emulsion aus. Diese Lösung oder Emulsion wird über die Ei nstoff-Düsen [7) großflächig auf die Klärbeckenoberfläche (10) aufgebracht.The metering pump (1) receives the undiluted liquid additive from the receiver (5) via a shut-off valve (6). The pump (1) continuously doses this additive into the suction line (11) of the further pump (2). This pump sucks from the sewage water tank to be fed with the additive Waste water (9) via the strainer basket (4). Waste water and additive reach the other pump (2), where they are mixed intensively. The bypass flow rate IventiI (8) in the bypass (3) can be used to set the amount of bypass and thus the ratio of additive to waste water. On the pressure side of the pump (2), the mixture emerges as a homogeneous solution or as an emulsion, depending on the affinity of the additive for the waste water (9). This solution or emulsion is applied over the egg nstoff nozzles [7) over a large area on the clarifier surface (10).
In einem praktischen Ausführungsbeispiel wurde als Dosierpumpe (1) eine Membran Dosierpumpe des Herstellers Pro-Minent des Typs B 25.001 und als weitere Pumpe [2) eine Zentrϊfugafpumpe des Herstellers DIA-Pumpen von Typ SRV/SOV 211 eingesetzt. AJ s Düsen (7) wurden AxiaIvollkegeIdüsen des Typs 460.748.16 CE des HersteIlers Lechler verwendet. In a practical exemplary embodiment, a diaphragm metering pump from the manufacturer Pro-Minent of type B 25.001 was used as the metering pump (1) and a centrifugal pump from the manufacturer DIA pumps of the type SRV / SOV 211 as a further pump [2). AJ s nozzles (7) were used with axial cone nozzles of type 460.748.16 CE from the manufacturer Lechler.
BezuσszeichenlisteReference list
(1) Dosierpumpe(1) dosing pump
(2) weitere Pumpe(2) another pump
(3) Bypass(3) bypass
(4) Ansaugsiebkorb(4) Intake strainer basket
(5) Vorlage(5) Submission
(6) Absperrarmatur(6) shut-off valve
(7) Einstoff-Düsen, Einstoffaxialdüsen(7) single-component nozzles, single-component axial nozzles
(8) Durchflußregelventil(8) Flow control valve
(9) Flüssigkeit, zu behandelnde (10) Flüssigkeitsbberflache(9) liquid, (10) liquid surface to be treated
(11) Saugieitung (11) Suction line

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Dosieranlage für Flüssigadditive insbesondere hoher Viskositäten mit einer Dosierpumpe (1) zum kontinuierlichen Behandeln von Flüssigkeiten (9), gekennzeichnet durch eine weitere Pumpe (2), deren Eingang an den Ausgang der Dosierpumpe (1) und an die zu behandelnde Flüssigkeit (9) angeschlossen ist.1. dosing system for liquid additives, in particular high viscosities, with a dosing pump (1) for the continuous treatment of liquids (9), characterized by a further pump (2), the input of which to the outlet of the dosing pump (1) and to the liquid to be treated (9 ) connected.
2. Dosieranlage nach Anspruch 1, gekennzeichnet durch an den Ausgang der weiteren Pumpe (2) angeschlossene, über der Oberfläche (10) der zu behandelnden Flüssigkeit (9) angeordnete Einstcoff Düsen (7) zum großflächigen Aufbringen des Additiv-Flüssigkeits-Gemischs auf die Flüssigkeirtsoberfläche (10).2. Dosing system according to claim 1, characterized by connected to the outlet of the further pump (2), arranged above the surface (10) of the liquid to be treated (9), Eincoff nozzles (7) for large-area application of the additive-liquid mixture to the Liquid surface (10).
3. Dosieranlage nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die weitere Pumpe (2 ) eine selbstansäugende Kreiselpumpe ist.3. Dosing system according to claim 1 or 2, characterized in that the further pump (2) is a self-priming centrifugal pump.
4. Dosieranlage nach einem der Ansprüche 1 bis 3 , dadurch gekennzeichnet, daß die Dosierpumpe (1) eine Membran-, Membrankolben- oder Kolbenpumpe ist.4. Dosing system according to one of claims 1 to 3, characterized in that the metering pump (1) is a diaphragm, diaphragm piston or piston pump.
5. Dosieranlage nach einem der Ansprüche 1 bis 4, gekennzeichet durch einen die weitere Pumpe (2) überbrückenden, ein Durchflußregelventil (8) aufweisenden Bypaεs (3). 5. Dosing system according to one of claims 1 to 4, marked by a bypassing the further pump (2), a flow control valve (8) having bypasses (3).
PCT/EP1989/000733 1988-06-23 1989-06-23 Dosing device for liquid additives, in particular high viscosity additives WO1989012605A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019900700297A KR900701667A (en) 1988-06-23 1989-06-23 Liquid additives, especially high viscosity dispensers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3821132.7 1988-06-23
DE3821132A DE3821132A1 (en) 1988-06-23 1988-06-23 DOSING SYSTEM FOR LIQUID ADDITIVES, IN PARTICULAR HIGH VISCOSITY

Publications (1)

Publication Number Publication Date
WO1989012605A1 true WO1989012605A1 (en) 1989-12-28

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Application Number Title Priority Date Filing Date
PCT/EP1989/000733 WO1989012605A1 (en) 1988-06-23 1989-06-23 Dosing device for liquid additives, in particular high viscosity additives

Country Status (5)

Country Link
EP (1) EP0348339A1 (en)
KR (1) KR900701667A (en)
AU (1) AU3872389A (en)
DE (1) DE3821132A1 (en)
WO (1) WO1989012605A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992012092A1 (en) * 1991-01-12 1992-07-23 Henkel Kommanditgesellschaft Auf Aktien Metering device for additives for the treatment of fluids

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU644747B2 (en) * 1991-07-17 1993-12-16 Meastrol Instrument Service Pty Limited Additive injector apparatus
FR2901158B1 (en) * 2006-05-19 2008-08-15 Otv Sa WATER TREATMENT DEVICE COMPRISING A REACTOR AND INJECTION MEANS IN THE REACTOR OF A REAGENT MOUNTED ON MOBILE MEDIA

Citations (6)

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Publication number Priority date Publication date Assignee Title
FR995916A (en) * 1948-10-18 1951-12-11 Onderzoekings Inst Res Device and method for uniformly distributing substances to be added to a viscous liquid, and products produced using the mixtures obtained
DE2012358B2 (en) * 1970-03-16 1971-09-23 Th. Goldschmidt Ag, 4300 Essen DEVICE FOR THE PRODUCTION OF DILUTED Aqueous CHEMICAL SOLUTIONS
DE2060436A1 (en) * 1970-12-08 1972-07-06 Pako Corp Non-air entraining mixer for fluids
JPS5644008A (en) * 1979-09-17 1981-04-23 Agency Of Ind Science & Technol Antifoaming agent
JPS58202025A (en) * 1982-05-20 1983-11-25 Toray Eng Co Ltd Proportional injecting and mixing apparatus
DE3718818A1 (en) * 1986-06-05 1987-12-10 Dennis Pardikes METHOD AND DEVICE FOR MIXING AND ACTIVATING POLYMERS

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR995916A (en) * 1948-10-18 1951-12-11 Onderzoekings Inst Res Device and method for uniformly distributing substances to be added to a viscous liquid, and products produced using the mixtures obtained
DE2012358B2 (en) * 1970-03-16 1971-09-23 Th. Goldschmidt Ag, 4300 Essen DEVICE FOR THE PRODUCTION OF DILUTED Aqueous CHEMICAL SOLUTIONS
DE2060436A1 (en) * 1970-12-08 1972-07-06 Pako Corp Non-air entraining mixer for fluids
JPS5644008A (en) * 1979-09-17 1981-04-23 Agency Of Ind Science & Technol Antifoaming agent
JPS58202025A (en) * 1982-05-20 1983-11-25 Toray Eng Co Ltd Proportional injecting and mixing apparatus
DE3718818A1 (en) * 1986-06-05 1987-12-10 Dennis Pardikes METHOD AND DEVICE FOR MIXING AND ACTIVATING POLYMERS

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, Band 8, nr. 41 (C-211)(1478), 22. February 1984; & JP-A-58202025 (TORAY ENGINEERING K.K.) 25. November 1983 *
World Patent Index, Derwent Access Number 81-42817D & JP-A-56044008 (AGENCY OF IND. SCI. TECH.) 23. April 1981 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992012092A1 (en) * 1991-01-12 1992-07-23 Henkel Kommanditgesellschaft Auf Aktien Metering device for additives for the treatment of fluids

Also Published As

Publication number Publication date
EP0348339A1 (en) 1989-12-27
DE3821132A1 (en) 1989-12-28
AU3872389A (en) 1990-01-12
KR900701667A (en) 1990-12-04

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